"Off-on-off" Fluorescence pH Switch of Three Trinuclear RuII Complexes Containing Imidazole Rings

被引：3

作者：

Cheng, Feixiang ^{[1
]}

Chen, Jishu ^{[1
]}

Wang, Fan ^{[1
]}

Tang, Ning ^{[2
]}

Chen, Longhai ^{[2
]}

机构：

[1] Qujing Normal Univ, Coll Chem & Chem Engn, Qujing 655011, Peoples R China

[2] Lanzhou Univ, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2011年 / 637卷 / 06期

关键词：

Ruthenium; pH Switch; UV/Vis spectroscopy; Fluorescence; Imidazole; ACID-BASE PROPERTIES; SPECTROSCOPIC PROPERTIES; PHOTOPHYSICAL PROPERTIES; POLYPYRIDYL COMPLEXES; DINUCLEAR RUTHENIUM; RU(II) COMPLEXES; OSMIUM COMPLEXES; EXCITED-STATES; DNA; LIGAND;

D O I：

10.1002/zaac.201000450

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Three tripodal ligands H3L1-3 containing imidazole rings were synthesized by the reaction of 1,10-phenanthroline-5,6-dione with 1,3,5-tris[(3-formylphenoxy) methyl] benzene, 1,3,5-tris[(3-formylphenoxy) methyl]-2,4,6-trimethylbenzene, and 2,2',2"-tris[(3-formylphenoxy) ethyl] amine, respectively. Trinuclear Ru-II polypyridyl complexes [(bpy)(6)Ru3H3L1 3](PF6)(6) were prepared by the condensation of Ru(bpy)(2)Cl-2 center dot 2H(2)O with ligands H3L1 3. The pH effects on the UV/Vis absorption and fluorescence spectra of the three complexes were studied, and ground-and excited-state ionization constants of the three complexes were derived. The three complexes act as "off-onoff" fluorescence pH switch through protonation and deprotonation of imidazole ring with a maximum on-off ratio of 5 in buffer solution at room temperature.

引用

页码：766 / 772

页数：7

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